Heat transfer CC

Which of the following best describes temperature?

• a measure of the average kinetic energy of the particles in a sample of matter

• heat absorbed or released in a chemical or physical change

• heat energy

• energy of change

The higher the kinetic energy of the particles in a sample of matter,

• the lower the temperature will be.

• temperature is not affected.

• the higher the temperature will be.

What units are used to measure heat and energy?

• meters or kilometers

• joules or kilojoules

• kelvin or celsius

• liters or kiloliters

What is defined as the heat required to raise the temperature of 1 g of a substance by 1 °C ?

• heat energy

• heat of formation

• specific heat

• heat capacity

Heat gained or lost = (mass)(specific heat)(change in temperatue) Q = mCΔT

How much energy is lost by 20 g of gold when it is cooled from 35°C to 25°C? The specific heat of gold is 0.13 J/g·°C.

• -26 J

• 26 J

• 17500 J

• 0.0006 J/g·°C

A 5.00 gram sample of a metal at 85.0 °C comes in contact with 100.0 grams of water at 25.0 °C. What is the direction of the heat flow and why?

• Metal to water, since heat flows from low mass to high mass

• Water to metal, since heat flows from high mass to low mass

• Metal to water, since heat flows from high temp. to low temp.

• Water to metal, since heat flows from low temp. to high temp.

4. If 5.00 grams of water is cooled from 65.2 °C to 35.6 °C, what is the heat produced? Cw=4.184 J/g ^oC

• 619 J

• -619 J

• -148 J

• 148 J

The energy needed to MELT a gram of a substance

• Specific Heat

• Heat of Chemistry

• Heat of vaporization

• Heat of fusion

Which 1 g sample will have the highest temperature after the addition of 200 J of energy?

• H₂O(l)

• H₂O(g)

• Pb

• Cu

During the vaporization of water, the kinetic energy...

• increases, while potential energy decreases

• increases, while potential energy stays the same

• stays the same, while potential energy increases

• stays the same, while potential energy decreases